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Try asking your class:
"What do I need to make a triangle?"
They'll probably say "three sides!"
"Will any three sides make a triangle then?"
They'll probably say "of course!"

Well, this investigation gives them a chance to play around with this idea. They will quickly realize that sometimes just putting three line segments together doesn't make a triangle. It depends on the lengths of those segments.

Common Core Math 7 has that sneaky little standard that hints at the Triangle Inequality Theorem (7.G.2) which basically answer the question, "If we're given a bunch of line segments, can they form a triangle?"

Rather than telling them a rule or set of rules, why not have them have them make sense of it themselves first? Just prepare the investigation and let them work!